LXC ignores lxc.rootfs.options on container reboot

When I issue a `systemctl reboot` within the container, instead of rebooting, it stops with an error.

This is my config:

# Template used to create this container: /usr/share/lxc/templates/lxc-debian
# Parameters passed to the template: -r jessie
# Template script checksum (SHA-1): 70e3d3a3adf290e12fc3522b2066039e079d8f1d

# Common configuration
lxc.include = /usr/share/lxc/config/ubuntu.common.conf

lxc.net.0.type = veth
lxc.net.0.hwaddr = 00:16:3e:9c:68:09
lxc.net.0.flags = up
lxc.net.0.link = br0
lxc.rootfs.path = /dev/vmdata-vg/lxc-jessie
lxc.rootfs.options = subvol=@
lxc.mount.fstab = /var/lib/lxc/jessie/fstab
lxc.tty.max = 4
lxc.pty.max = 1024
lxc.arch = amd64
lxc.uts.name = jessie
lxc.cap.drop = sys_module mac_admin mac_override sys_time

I have a suspicion that it might ignore lxc.rootfs.options and tries to mount the root BTRFS volume directly and can't find /sbin/init there.

I found the following lines of interest in the log.

Correct mount on first boot (lxc-start):
lxc-start jessie 20230119225558.271 DEBUG conf - conf.c:lxc_mount_rootfs:1436 - Mounted rootfs "/dev/vmdata-vg/lxc-jessie" onto "/usr/lib/x86_64-linux-gnu/lxc" with options "subvol=@"

Here the container requests reboot:
lxc-start jessie 20230119225946.800 INFO lxccontainer - lxccontainer.c:do_lxcapi_start:1128 - Container requested reboot

After the reboot, the mount options are "(null)" instead of "subvol=@":
lxc-start jessie 20230119225947.374 DEBUG conf - conf.c:lxc_mount_rootfs:1436 - Mounted rootfs "/dev/vmdata-vg/lxc-jessie" onto "/usr/lib/x86_64-linux-gnu/lxc" with options "(null)"

LXC can't execute /sbin/init because the BTRFS root is mounted instead of the subvolume:
lxc-start jessie 20230119225947.853 NOTICE start - start.c:start:2161 - Exec'ing "/sbin/init"
lxc-start jessie 20230119225947.853 ERROR start - start.c:start:2164 - No such file or directory - Failed to exec "/sbin/init"